I'd also advise you to send an e-mail (using another e-mail account) to inform all your contacts about the situation.
~ OFF THE RECORD ~
Here is an idea that might help you or Yahoo to find the IP address of the intruder:
Using another e-mail account, send a provoking e-mail to your hacked e-mail address and somehow manage the hacker to reply back.
Of course, the hacker should not know it is you that he/she is replying to (pretend that you are one of your female friends asking you to see if you wanted to see Vacation pictures from a nudist French colony or something like that).
This could naturally provide some info on the hacker's geographical location as well as his/her IP...
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